{
  "annotation_id": "da4365e3-c99f-4297-ae88-cb58930e4830",
  "date_created": "2026-03-02T18:01:52.616000Z",
  "date_modified": "2026-03-02T18:01:52.616000Z",
  "file_hash": "9f68a7ae8ca4ac96768e53fc82b6db53740534aa94c88dbf21ebb0aeafe4446f",
  "private": false,
  "record": {
    "abstract": "We study experimentally the spatial distribution of quantum noise in the twin\nbeams produced by a type II Optical Parametric Oscillator operating in a\nconfocal cavity above threshold. The measured intensity correlations are at the\nsame time below the standard quantum limit and not uniformly distributed inside\nthe beams. We show that this feature is an unambiguous evidence for the\nmultimode and nonclassical character of the quantum state generated by the\ndevice.",
    "arxiv_id": "quant-ph/0210023",
    "authors": [
      "Marcello Martinelli",
      "Nicolas Treps",
      "Sara Ducci",
      "Sylvain Gigan",
      "Agnes Maitre",
      "Claude Fabre"
    ],
    "categories": [
      "quant-ph"
    ],
    "doi": "10.1103/PhysRevA.67.023808",
    "title": "Experimental study of the spatial distribution of quantum correlations   in a confocal Optical Parametric Oscillator",
    "url": "https://arxiv.org/abs/quant-ph/0210023"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "c377ef1a-5260-4c65-9abb-4c72d7e7fbf4",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}